Copolymers having repeating units derived from monocyclic esters or carbonates and certain bicyclic diesters and/or carbonates have controllable rheological properties. The bicyclic diester and/or carbonate copolymerizes easily with the monocyclic monomers, especially with lactide, to form copolymer that can have tailored levels of branching. The copolymers have excellent rheological properties, including increased melt tensions and improved shear thinning, compared to the analogous linear polymers.
具有由单环酯或
碳酸盐和某些双环二酯和/或
碳酸盐衍生的重复单元的共聚物具有可控的流变特性。双环二酯和/或
碳酸盐很容易与单环单体共聚,特别是与内酯共聚,形成可定制支化程度的共聚物。与类似的线性聚合物相比,共聚物具有优异的流变特性,包括更高的熔体张力和更好的剪切稀化性。